This source gives an overview of the 2011 Census in India. According to this resource, the census has a long history, dating back to the Mauryan and the Mughal period. Today, the census is conducted once in a decade, following an extended de facto canvasser method. Coordination at the state, district, village, and ward level is necessary for successful taking of census.
This online resource details the functions and planning of the census in India as well as the monitoring and supervision that ensures the census is properly executed.